Electric motor.



F. S. DENISON.

ELECTRIC MOTOR.

APPLICATION r1150 NOW-2,1914. 1,167,890. Patented Jan. 11, 1916.

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ELECTRIC MOTOR.

APPLICATION FILED NOV. 2. 1914.

Patented J an. 11, 1916.

3 SHEETSSHEET 2.

i m 9 WW rm 3 m LS3 WZTNESsL-S M Cg? U urrah snares} PATENTS FREDERICK S. ID E'NISON, F MINNEAFOLIS, MINNESOTA, ASSIGNOR T0 IJHNNEAPOLIES HEAT REGULATOR (30., OF MINNEAPOLIS, MINNESOTA, A CORPORATION.

ELECTRIC MOTOR.

Z '0 all whom it may concern: a

Be it. known that I, FREDERICK S. DENI- SON, a citizen of the United States, resident Y of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Electric Motors, of

which the following is a specification.

My invention relates to that type of elecif tric motors adapted for use with a thermostat for controlling the movement of dampers 61' valves. Y

The primary object of my invention is to provide a motor that is capable of being 0peratedby a direct current from abattery or an alternating current through a transformer.

A further object is to provide a means for locking the armature and the circuit closing device or the electric 'motor circuit to. prevent vibration of the armaturewhen the alternating current is used.

A further object is to provide an improved contact for the circuit closing' means of the electric motor to insure anuninterrupted circuit while the machine is in operation.

A further object is to' provide a motor of,

" In the accompanying drawings forming part of this specification, Figure 1 is a front elevation of a m'otor'embod ing my inven tion, Fig. 2 is a planview o the same, Fig.

, 3 is a vertical sectional view, illustrating the normal position of the armature and the means for checking the momentum of the electric motor armature, Fig. 4: is a side elevation of the'inachi ne, Fig. 5 is a planview of the base, with the motor mechanism removed, Fig. 6 is a detail sectional view, illustrating the position assumed by the armature when the circuit is closed through the electric motor to operate the gear mech'anism of the machine, and showing the locking device in position to prevent the return of the niagnet armatureto its normal posi-.

Speeification of Letters Patent.

tion, Fig '7 is a similar view, illustrating the tripping of the locking device to release the armature and allow it to return to itsnormalposition when the crank shaft has reached a predetermined point.-

- In'the drawing, 2 represents the base of the motor, of suitable material, preferably Patented Jan. 11, 1916. Application filed November 2, 1914. Serial No. 869,897.

with. The electric motor itself has the usual fields 6 and armature 7 mounted on a shaft 8. A pinion 9 through a train of gears :10

operates-a crank shaft 11' that is journaled in the standards 4 and 5. On this shaft the vcrank 12 for connection with the dampers or valves, is mounted, as usual in motors of th s type. On one slde of the electr1c motor casing I arrange a pair of electr'omagnets 13, having an armature 14 pivoted at 15 in the standards 4 and 5 and provided with an upwardly projecting arm 16. A disk 17 is mounted on the shaft 11 and is provided in its periphery with notches 18. These notches are adapted to receive the upper end of the arm 16 and allow the armature to swing upward by gravity away from the cores of the magnets 13. On the standard 5 an L-shaped locking latch 19 is pivoted having a notch 20 to receive the upper end of the arm '16 and a weight 21 for normally holding the said latch in engagement with said arm and preventing the armature from swinging upward to its normal position after the circuit ter' is used, the armature will be temporarily locked in its depressedposition, even when the circuit is broken through the magnets,

rent through a transformer. When theylatand vibration or jumping of the armature v will be positively prevented and the circuit through the electric motor will remain closed until a predetermined point 'is reached in the operation of the motor.

Pins 22 'are .mounted in the disk 17 in position to engage the lever 19 and raise it to the position illustrated in Fig. 7 to release the arm 16 just before one of the notches 18 reaches a point where, the said arm could drop therein and allow the return of the armature to its normal position. The disk 17 is also provided with a pin 23, mounted loosely therein, and normally projected'by a spring 24 toward contact posts 25 and 25 mounted in the standard 5 and insulated therefrom.

The shaft 8' of the electric motor has a disk 26 thereon provided with shoulders 27 in position to contact with a spring 28 mounted on an arm 29 that projects inwardly from the arm 16 near its pivotal support. This spring 28 serves as a stop for the disk 26 and checks the momentum of the electric motor armature when it has reached the limit of its movement or when the crank shaft has made a half revolution. The' spring 28 mav be bent to adjust it properly in the path of the disk. .The armature 141 is also provided with a depending arm 30 pro vided with a contact screw 31 that is adapted to engage a contact spring32 carried by a binding post 33 on the baseand insulated therefrom. This contact spring is preferably arched in cross section, as illustrated in Fig. 6. so that the contact screw31 will havea sliding bearingthereon and insure a good contact under all conditions.

I prefer to provide a guard plate 32 overhanging the contact spring 32 and preventing it from bending upward and making premature contact with the screw 31. The lockingof the latch will holdthe contact screw 31 in engagement with the spring plate and insure an uninterrupted circuit of the alternating current therethrough when the motor is used with such a current th ough a transformer.

Thebase of the motor is provided with a b nding post 34 in circuit therewith and is also rovided with similar bind ng posts 35, 36. 37 and 38, the four latter being insulated from the base. A conductor 39 leads from the base 34 through a battery B'to the post 36 and a conductor 40 leads from the post .36 to one co e of the magnets, and a similar conductor 41 leads fromthe post 35 to the other magnet. A conductor 42 leads from the post 36 to one pole 43 of the electric motor, and a conductor leads from the other pole'45 thereof to the post 33, and conductors 46 and 47 lead respectively from the posts 37 and 38 to the contact posts 25 and 25. A binding post 48 is mounted in the' base and in circuit through a conductor 49 .with the circuit closing bar of a thermostatic device 50, while conductors 51 and 52 connect the contact post of the hot and cold s des of the thermostat with the posts 37 and a 38. To shift the dampers without changing the thermostat. as when the operator desires to put fuel in the heating apparatus, I provide a switch bar 53 mounted on the post 35 in position to make contact withthe binding post 48, but" normally insulated from the posts 37 and 38 and the base of the machine by insulating plates 54, between which'the free end of the switch bar is adapted to I slide.

I prefer to provide a curved slot 55 in the base, through which a finger grip on the switch bar projects in position for convenient operation. Each of the binding posts 37 and 38 is provided with a spring contact plate 56 adapted to close the circuit through the switch bar when it is moved to the right or left to start the motor and shift the dampers. Normally, the switch bar will be in its central neutral position, as shown in Fig. 5, and when so adjusted, the circuit will be closed only through the thermostat.

The operation of the motor is as follows: Assuming that the thermostat has closed 'the circuit through the conductors 4:9 and 52, the electromagnets will be energized to attract the armature 15, and the arm 16 will be disengaged from one of the notches 18 in the disk 17 and the spring 28 raised out of engagement with the disk 26 and at the same time the notched end of the latch 19 will en the electromagnet circuit through the thermostat will be instantlv broken, but the armature 14 being locked by the lever 19, will remain in its tilted position, closing the circuit through the spring 32 until the disk 17 has nearly completed its half revolution, "when one of the pins 22 will engage the latch 19 and tilt it from 'its locking position, allowing the arm 16 to ride upon the periphcry of the disk 17 and drop into one of the notches 18 .therein iust as the half revolution is completed. The return of, the armatureto its normal position will raise the'contact screw 31 and break'the circuit through the electric motor and 'stop the machine. When the armature returns to its normal position, the arm 29 will drop down and the spring 28 engaging the disk 26 will positively check the momentum of the electric motor and armature.

It will be noted from the foregoing description that when the armature is enercgizedby the closing of the circuit through the thermostat, that the contact screw of the electric motor circuit will be moved into engagement with the contact spring 32 and be locked in such position, thereby adapting the device for use with an'alternating current,

and the slid ng contact of the screw with the plate 32 will have'the effect of keeping the surface clean and insuring a good connection. Furthermore, the plate or housing,

masses of an electric motor geared thereto and having an electric circuit, electromagnets and a thermostatic circuit therefor, an armature for said magnets, a circuit closer for said electric motor circuit carried by said armature for closing said electric motor circuit when said armature is attracted by the energizing of said magnets, means for locking said armature in its attracted position I an electric motor geared thereto and having an electric circuit, electroma'gnets and a thermostaticclrcu t therefor, an armature for said magnets, a circuit closer for said electric motor circuit earned by said armaturefor closlng said electric motor c1rcu1t Y when said armature is attracted, and means I for locking'said'armature in its attracted- 'positionfor a predetermined movement ofsaid. shaft, and means. for breaking the cir-.

cuit through said magnets upon the initial movement of said motor.

2. The combination with a, crank shaftand crank arms, of anelectric motor geared to said shaft. and having an electric circuit,

there for, an armature for said magnets, a clrcuit closer for said electriomotor circult 3o actuated by said" armature for closing said electric motor circuit when said armature isattracted, means'for locking said armature in its attracted position for predetermined-movement of said shaft, and a circuit" breaker mounted to break the circuit through said. magnets and release said arma ture -upon the initial movement of ,said

motor. l

I 3. The 40 of an electric motor mountedxthereon, a

elect'romagnets and a thermostatic circuitcombination, with a suitable-base,

- crank shaft mounted on the'frame" of said motor. and having crank arms, a. gearing between sald motor and stud crank shaft, an

electric'circuitffor said motor, electromag- I nets and a thermostatic circuit'therefor, an armature for sa1d.magnets,- a circuit closer for closlng sald electric motor circult when said armature is attracted, means forlocking said armature in its attracted position for a oredetermin'edmovement of said shaft, and means for breaking the circuit through said magnets after the initial movement of said motor.

1 -4.'The'-combination, with a crank shaft,

of an electric motor s earedthereto and having an electric circuit, ,electromagnets, a thermostatic circuit therefor, an armature for said magnets, a circuit closerfor closing said electric motor circuit when said armature is attracted by said magnets, and means for checking'the movement of said electric motor-when the electric rmotor circuit .is

broken by the release of said magnet arma-.

ture.' 5;. The combination, WliJh a crank shaft,

for a predetermined movement of said shaft,

and means carried by said armature for checking the movement of said electric motor armature when the electric motorcircuit is broken at the erld of said shaft movement. I I N 6. The combination, with a crank shaft and an electric motor geared thereto, and.

having an electric circuit, of electromagnets and a thermostatic circuit therefor, can armature for; said magnets, a circuit, closer for said electric motor circuit carried by said 1 armature, a disk having s shoulders Y thereon connected with thearmature of said electric motor, an arm mounted on said magnet armature in position'to contact with a shoulder on said disk and check the move ment of sai electric motor armature, a circuit closer for said electric motor circuit carried by said magnet armature, and means for locking said magnet armature in its attracted position foravpredetermined movement of said shaft. \I L 7 The combination, with a crankshaft, of afthermostatic circuit and contact studs for said circuit adjacent to said shaft, a diskmounted to revolve with said shaft,= electro- 'magnets in said thermostatic circuit, an

armature therefor having an arm to engage said diskfia. latch mounted to engagesaid arm and lock said armature in its attracted pos1t1on,.a circuit breaking devlce comprlsing a spring-pressed pin mounted in. said disk and contacting alternately with said contact studs to make and break said thermostatic circuit. and means carried by said disk for tripping said magnet armature after apredetermined movement of, said shaft. I

. 8. The combination, with a crank shaft,

of a thermostatic c ircuit, and contact studs for said'circuit, a'jdisk mounted to revolve with said shaft, electromagnets in said ther- I mostatic circuit and an armature therefor, a

circuit breaking device comprising a spring I pressed pin mounted'in said disk and contacting alternately with said contact studs to makeand break said thermostatic cir cuit, and means fortripping said magnet armature at a predetermined movement on said disk. I

9. The-combination, with a base, ,of' an electric motor mounted thereon and having a shaft and a notched disk secured on said point in the shaft, an electric circuit for said motor, a

crank shaft mounted on said motor frame and geared to said motor, electromagnets and a thermostatic circuit therefor, an armature for said magnets, a circuit closer for closing said electric motor circuit when said armature is attracted, means for locking said armature in its attracted position for a predetermined movement of said shaft, and means carried by said armature for engaging said notched disk for checking the movement of said electric motor at the end 10 of the movement of said shaft.

In Witness whereof, I have hereunto set my hand this 21st day of October, 1914.

FREDERICK s. DENISONJ 

